I feint with the right, then when they lean to their left to avoid the right, I come over the top and get them on the way up. It combines your power and their momentum.

It is hard to practice on a traditional bag. But it is one I love to work on my Power Puncher 2000.I put the connection point up high and move the vertical pulley out to take up the slack. It's a thing of beauty.

It is easiest to practice this punch on an uppercut bag---one that hangs horizontally.